display specific name on a graph with the cursor

Question

Christophe Nell 2015-7-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/231892-display-specific-name-on-a-graph-with-the-cursor

评论： Christophe Nell 2015-8-4

采纳的回答： Jan

在 MATLAB Online 中打开

Hello, I want to be able to display the name of the dot in a graph according to the vector position.

my code is

function
fig = figure;
a = [1 2 3 4 5]
b = [2 3 4 5 6]
name{1} ='one';
name{2} ='two';
name{3}='tree';
name{4}='four';
name{5}='five';
scatter(a, b, 'filled')
dcm_obj = datacursormode(fig);
set(dcm_obj,'UpdateFcn',@myupdatefcn)
end
function txt = myupdatefcn(empt,event_obj)
pos = get(event_obj,'Position');
nameNumber = 'WantCorrectNameHere';
txt = {['X: ',num2str(pos(1))],...
     ['Y: ',num2str(pos(2))],...
     nameNumber};
end

So I want to have access to the right name at the selected position for exemple for a(1);b(1) -> name{1}

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Answer 1

Jan 2015-7-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/231892-display-specific-name-on-a-graph-with-the-cursor#answer_187817

编辑：Jan 2015-7-31

在 MATLAB Online 中打开

Perhaps the SnapToDataVertex mode is useful?

function
fig = figure;
a = [1 2 3 4 5];
b = [2 3 4 5 6];
name = {'one', 'two', 'three', 'four', 'five'};
DCM_Data.Position = [a; b];
DCM_Data.Title = name;
scatter(a, b, 'filled')
dcm_obj = datacursormode(fig);
set(dcm_obj,'UpdateFcn', {@myupdatefcn, DCM_Data});
end
function txt = myupdatefcn(empt,event_obj, DCM_Data)
pos = get(event_obj,'Position');
[dummy, index] = min(((pos(1) - DCM_Data.Position(1, :)).^2) + ...
                     ((pos(2) - DCM_Data.Position(2, :)).^2));
nameNumber = DCM_Data.Title{index};
txt = {['X: ',num2str(pos(1))],...
     ['Y: ',num2str(pos(2))],...
     nameNumber};
end